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Email is still
how they
get in.

Managed email security for Microsoft 365 — anti-phishing, BEC, DMARC

90% of breaches start in the inbox. Layered email security goes beyond what Microsoft ships by default — catching the BEC, impersonation and zero-day attachments that pay attackers every week.

Layer it up What's included
Avanan Mimecast Abnormal DMARC enforced
01 / WHAT'S INCLUDED

Six layers
between the attacker
and the inbox.

01

Anti-phish & anti-BEC

ML-driven detection beyond signatures. Tone, language patterns, behavioural anomalies, lookalike domains, display-name spoof.

02

Attachment sandboxing

Attachments detonated in an isolated sandbox before delivery. Macros, embedded scripts and exploit behaviour caught on zero-day basis.

03

URL rewriting & time-of-click

Every link rewritten and checked at click time, not just delivery. Catches weaponisation that happens after the email lands.

04

Impersonation protection

Exec and finance accounts tagged. Display-name, domain and homoglyph spoof detected. External reply banners where appropriate.

05

DMARC, SPF, DKIM

Your sending domain locked down. DMARC taken to p=reject with reporting, so nobody spoofs you either.

06

User reporting & remediation

Phish-alert button in Outlook. Reported messages auto-investigated, clawed back from other inboxes if confirmed malicious.

02 / HOW WE RUN IT

Assess. Layer.
Enforce. Tune.

  1. STEP 01

    Assess

    Baseline your current posture. Defender config review, DMARC/SPF/DKIM audit, catch-rate sample. A no-BS "what's really slipping through" report.

    • Defender review
    • DMARC audit
    • Catch-rate sample
  2. STEP 02

    Layer

    Deploy the right gateway (Avanan inline, Mimecast upstream or Abnormal post-delivery). Configured to your user base and risk profile, not a generic template.

    • Gateway deployed
    • Policy pack
    • Outlook add-in
  3. STEP 03

    Enforce

    DMARC journey started. Legitimate senders inventoried. Move from p=none → p=quarantine → p=reject, without breaking a single campaign along the way.

    • Sender inventory
    • DMARC progression
    • Reporting dashboard
  4. STEP 04

    Tune

    First 30 days we hand-review misses and false positives. After that, ongoing monthly tuning. Board-grade report each month: caught, missed, released, reported.

    • Miss review
    • FP tuning
    • Monthly report
03 / WHY IT MATTERS

Defender-only
is a rounding error.

Microsoft's native filtering catches a lot. Attackers know exactly what it looks for, and craft around it. A dedicated email security layer adds the adversarial signals Defender can't — inline URL protection, sandboxing, ML behavioural BEC detection — and tightens your sending side so nobody spoofs you.

  • ✓
    BEC stopped pre-clickInvoice fraud, payroll fraud, CEO fraud caught at ingest rather than weeks later.
  • ✓
    Zero-day attachmentsSandbox behaviour wins over signature, every time.
  • ✓
    Your domain protectedNobody spoofs you; your customers stop getting phished in your name.
  • ✓
    Fewer user pop-upsTraining-wheel banners are annoying. We'd rather block the bad email than nag the user.
INBOUND · LAYERED FILTER SPF · DKIM · DMARC REP · SANDBOX · ML URL REWRITE · CLICK IMPERSONATION USER REPORT INBOX 6 LAYERS · 99.9% CAUGHT
04 / FAQ

Questions
we hear a lot.

Isn't Microsoft Defender for O365 enough?

It's a reasonable baseline but it's a known quantity — attackers test against it daily. We layer a dedicated email security gateway (Avanan/Check Point, Mimecast, or Abnormal depending on profile) in front of or alongside Defender to catch what tuned adversaries engineer past.

Do you enforce DMARC?

Yes. We take your domain from p=none to p=quarantine to p=reject methodically, with DMARC reporting configured so nothing legitimate breaks. Typical timeline 6–12 weeks.

What about BEC and CEO fraud?

Impersonation protection, lookalike-domain detection, display-name spoofing and anomaly-based BEC detection are all in scope. Finance and exec accounts get extra tuning.

Can users still release blocked emails?

Yes — a quarantine digest lands with end users on a schedule you choose (typically daily). They can release non-risky items themselves; anything malicious is admin-only release.

Which gateway do you recommend?

Avanan/Check Point inline for most SMBs (great BEC detection, minimal MX changes). Mimecast upstream for compliance-heavy clients. Abnormal post-delivery for larger tenancies. We pick per fit.

Will it slow mail delivery?

No. Inline gateways add a few hundred ms; post-delivery API solutions are invisible to users. We measure before and after and share the numbers.

RELATED SERVICES

Often runs with.

01

M365 MDR

Email security catches pre-delivery. MDR catches post-delivery tenancy compromise. Both.

Read more 02

Managed ITDR

The identity layer — token theft, MFA fatigue, AiTM phishing. Same SOC, one correlated view.

Read more 03

DNS filtering

If the user does click, DNS filtering is the last-chance block. Complementary to URL rewriting.

Read more
NEXT STEP

Free catch-rate
sample.

We'll run a 14-day passive scan against your mail flow and show you exactly what Defender is letting through. No MX changes, no disruption.

Book the scan hello@techzura.com
UPLIFT
~40%
DMARC
p=reject
SOC
24/7